Cooking gas is a mixture of:
A. Carbon monoxides and carbon dioxide
B. Butane and propane
C. Methane and ethylene
D. Carbon dioxide and oxygen

Hint: Liquefied petroleum gas is a flammable mixture of hydrocarbon gas, used as a fuel in heating appliances, cooking equipment etc. It is increasingly used as an aerosol propellant and a refrigerant, replacing chlorofluorocarbons in an effort to reduce damage to the ozone layer.

Complete step by step answer:
What is cooking gas?
LPG gas comes from oil and gas wells, as it is a fossil fuel. LPG is a mixture of flammable hydrocarbon gases that include propane, butane, isobutene and mixtures of the three LPG gases.

What is LPG made up of?
LPG is made up of carbon and hydrogen atoms forming propane and butane whilst natural gas is made up of lighter methane, the simplest carbon and hydrogen molecule. LPG is made up of a group of flammable hydrocarbons gases that are liquefied through pressurisation and commonly used as fuel. Natural gas is liquefied cryogenically. LPG is stored in steel vessels ranging from small BBQ gas bottles to larger gas cylinders and tanks. They are commonly used for generating heat for home heating, hot water, cooking including boilers.

Therefore, cooking gas is a mixture of butane and propane.
Option B is your answer!

Note: Isobutane is the other common LPG gas but is not typically used for heating. The main uses of isobutene are as petrol additive, as a refrigerant and as a feedstock for plastics. As a cost-effective energy source, LPG can be up to five times more efficient than traditional fuels, resulting in less energy wastage and better use of our Planet’s resources.